Buy Arm & Hammer - Free Spot the Differences

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Buy Arm & Hammer

An advetising poster ca. 1900 for the household must-have becomes a canvas for a 15-difference puzzle.
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The older Java version of this puzzle is available if needed.

Wikimedia image is in the Public Domain
To view the original image and license: https://commons.wikimedia.org/wiki/File:Arm_%26_Hammer_Brand_Soda_poster_ca._1900.jpg